Overview

Wiksplit is a simple web app that allows users to take a picture of a receipt and split the items amongst a group of people. Select items that you contributed to and the app will calculate how much you owe. Share receipts with others and view edits in real-time

Demo

wikDemo.mp4

Technologies used

• NextJS for frontend, FastAPI for backend
• Image OCR and LLMs for text extraction and receipt parsing
• Google OAuth2 and JWTs for secure user authentication and API access
• SQLite for storing user data and receipt information
• Docker for hosting the backend
• ngrok for mobile testing

Findings

• learned how signing and verifying tokens work to securely transfer sensitive data between client and server.
• explored how cookies are sent across domains and how they could be exploited through CSRF and XSS attacks.
• fundamentals of Docker for packaging and deploying backend to cloud services.
• designed effecient SQL database schema with automatic updates and deletions using triggers.

• implementented PostgreSQL additionally for scalability and permanence.
  

• experimented with various preprocessing techniques to improve text extraction accuracy.
• scheduled backround tasks on event loop and used worker threads to keep UI responsive when doing synchronous blocking writes to the database.
• implemented logging file to track and record malicious requests to the API.
• configuring and deploying different environments for development and production.